package Practice;

import java.util.Scanner;

public class Monkey {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int count = 1;
        for (int i = 0; i < n-1; i++) {
            count = (count + 1) * 2;
        }
        System.out.println(count);
    }
}
